Southern Sky Survey

A photographic survey of the sky south of declination
-17°, carried out jointly by the 1.2-meter United Kingdom Schmidt Telescope
at Siding Spring and the European Southern Observatory's 1-m Schmidt camera.
Both these instruments have the same focal
length as the 1.2-m Oschin Schmidt, which produced the northern-hemisphere
Palomar Observatory Sky Survey, so the
scale of the plates in each survey is identical.